Adopt advanced frontward open system,,butterfly type,with two semicircle shutter doors,small wind resistancel,good air-tightness and high efficiency.

For the cone part,adopt new design,plug-type connection,not need many bolts and nuts for tightening as before,Indensity of labor is reduced,also improve aesthetic results of fan.

The belt tensioner device made of aluminum-magesium alloy,non-deforming,long service life,This device make the belt inside tight up,effective for avoiding the belt distortions in reverse direction,so prolong the belt life time,saving cost.

When the two semicircle shutter doors close,the rubber sealing ring make good air-tigtness.in different condition,not run all the fan,the air could pass through the space of stop fan,use this type fan,could aviod this problem.Ebsure air pass through the evaporative cooling or air  inlet only,so that greatly improve the fan efficiency,(as compared with different type of same size fan,improve efficiency15-20%)

The fan motor installde on top left corner,effective protection of the motor.Avoid wind resistance .And the motor panel connection is reasonable,fixing fan frame more stronger.